Add StockChanges index

app/controllers/application_controller.rb

@@ -99,6 +99,11 @@ class ApplicationController < ActionController::Base
     @supplier = Supplier.find(params[:supplier_id]) if params[:supplier_id]
   end
 
+  # Get stock_article in nested resources
+  def find_stock_article
+    @stock_article = StockArticle.undeleted.find(params[:stock_article_id])
+  end
+
   # Set config and database connection for each request
   # It uses the subdomain to select the appropriate section in the config files
   # Use this method as a before filter (first filter!) in ApplicationController

app/controllers/stock_changes_controller.rb

@@ -0,0 +1,8 @@
+#encoding: utf-8
+class StockChangesController < ApplicationController
+  before_filter :find_stock_article
+  
+  def index
+    @stock_changes = @stock_article.stock_changes(:readonly => true).order('stock_changes.created_at DESC')
+  end
+end

app/helpers/stock_changes_helper.rb

@@ -0,0 +1,13 @@
+module StockChangesHelper
+
+  def link_to_stock_change_reason(stock_change)
+    if stock_change.delivery_id
+      t '.delivery'
+    elsif stock_change.order_id
+      t '.order'
+    elsif stock_change.stock_taking_id
+      t '.stock_taking'
+    end
+  end
+
+end

app/models/stock_article.rb

@@ -17,6 +17,10 @@ class StockArticle < Article
     quantity - OrderArticle.where(article_id: id).
         joins(:order).where("orders.state = 'open' OR orders.state = 'finished'").sum(:units_to_order)
   end
+  
+  def quantity_history
+    stock_changes.reorder('stock_changes.created_at ASC').map{|s| s.quantity}.cumulative_sum
+  end
 
   def self.stock_value
     available.collect { |a| a.quantity * a.gross_price }.sum

app/models/stock_change.rb

@@ -1,6 +1,7 @@
 class StockChange < ActiveRecord::Base
   belongs_to :delivery
   belongs_to :order
+  belongs_to :stock_taking
   belongs_to :stock_article
 
   validates_presence_of :stock_article_id, :quantity

app/views/stock_changes/index.html.haml

@@ -0,0 +1,17 @@
+- title t('.stock_changes', :article_name => @stock_article.name)
+
+%table.table.table-hover#stock_changes
+  %thead
+    %tr
+      %th= t '.datetime'
+      %th= t '.reason'
+      %th= t '.change_quantity'
+      %th= t '.new_quantity'
+  %tbody
+    - reversed_history = @stock_article.quantity_history.reverse
+    - @stock_changes.each_with_index do |stock_change, index|
+      %tr
+        %td= l stock_change.created_at
+        %td= link_to_stock_change_reason(stock_change)
+        %td= stock_change.quantity
+        %td= reversed_history[index]

app/views/stockit/index.html.haml

@@ -56,6 +56,7 @@
         %td= article.article_category.name
         %td
           = link_to t('ui.edit'), edit_stock_article_path(article), class: 'btn btn-mini'
+          = link_to t('ui.history'), stock_article_stock_changes_path(article), class: 'btn btn-mini'
           = link_to t('ui.delete'), article, :method => :delete, :confirm => t('.confirm_delete'),
             class: 'btn btn-mini btn-danger', :remote => true
 %p

config/initializers/extensions.rb

@@ -9,4 +9,11 @@ class String
       string
     end
   end
-end
+end
+
+class Array
+  def cumulative_sum
+    csum = 0
+    self.map{|val| csum += val}
+  end
+end

config/routes.rb

@@ -96,6 +96,8 @@ Foodsoft::Application.routes.draw do
         get :articles_search
         get :fill_new_stock_article_form
       end
+      
+      resources :stock_changes, :only => [:index], :to => 'stock_changes'
     end
 
     resources :suppliers do